A look at how Ken Griffey Jr.'s autograph has changed through the years - Sports Collectors Digest

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A look at how an autograph has changed for three former major leaguers - Sports Collectors Digest

What's the point in investing in rookie cards if the player isn't a rookie anymore? How would the value change? - Quora

Ken Griffey, Jr. PSA AutographFacts℠

1995–2010 – SABR's Baseball Cards Research Committee

Ken Griffey, Jr. PSA ProBatFacts℠

Wayback Machine: Ken Griffey Jr., The Natural - Sportspress Northwest

2005 Ultimate Signature Home Runs Dual Autograph #RG Frank Robinson / Ken Griffey Jr. / 250

Beckett Baseball Fevereiro 2015 by Beisebol Links - Issuu

1995–2010 – SABR's Baseball Cards Research Committee